1247621980900 has 27 divisors (see below), whose sum is σ = 2707363937019. Its totient is φ = 499044324480.

The previous prime is 1247621980883. The next prime is 1247621980987. The reversal of 1247621980900 is 90891267421.

The square root of 1247621980900 is 1116970.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 310768341156 + 936853639744 = 557466^2 + 967912^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11113852 + ... + 11225548.

Almost surely, 2^{1247621980900} is an apocalyptic number.

1247621980900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1247621980900 is the 1116970-th square number.

It is an amenable number.

1247621980900 is an abundant number, since it is smaller than the sum of its proper divisors (1459741956119).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247621980900 is an frugal number, since it uses more digits than its factorization.

1247621980900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223408 (or 111704 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

Multiplying 1247621980900 by its sum of digits (49), we get a square (61133477064100 = 7818790²).

The spelling of 1247621980900 in words is "one trillion, two hundred forty-seven billion, six hundred twenty-one million, nine hundred eighty thousand, nine hundred".